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参数资料
| 型号： | MAX16834ATP/V+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR HIGH BRIGHT 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 拓扑： | PWM，SEPIC，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 高亮度 LED（HBLED），RGB |
| 频率： | 100kHz ~ 1MHz |
| 电源电压： | 4.75 V ~ 28 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 125°C |
MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
lowing equation. The MOSFET must be mounted on a
board as per manufacturer specifications to dissipate
the heat.
The RMS current rating of the switching MOSFET Q1 is
calculated as follows for boost and boost-buck configu-
rations:
Rectifier Diode
Use a Schottky diode as the rectifier (D1) for fast
switching and to reduce power dissipation. The select-
ed Schottky diode must have a voltage rating 20%
above the maximum converter output voltage. The max-
imum converter output voltage is V LED in boost configu-
ration and V LED + V INMAX in boost-buck configuration.
ID RMS = ?
?
?
? ?
( IL AVG ) 2 × D MAX ? × 1 . 3
The current rating of the diode should be greater than
I D in the following equation:
P COND = ( IL AVG ) × D MAX DSON
× R
? IL AVG LED GD SW ?
× V
× C
× f
P SW = ? ?
?
?
× ?
+
? IL AVG × ( V LED + V INMAX ) 2 × C GD × f SW ?
P SW = ? ?
?
?
+
× ?
V LED × ( 1 - D MAX ) 2
2 π × L × I LED
where ID RMS is the MOSFET Q1’s drain RMS current in
amperes.
The MOSFET Q1 will dissipate power due to both
switching losses as well as conduction losses. The con-
duction losses in the MOSFET is calculated as follows:
2
where R DSON is the on-resistance of Q1 in ohms with
an assumed junction temperature of +100°C, P COND is
in watts, and IL AVG is in amperes.
Use the following equations to calculate the switching
losses in the MOSFET:
Boost configuration:
2
2
? 1 1 ?
?
? IG ON IG OF F ?
Boost-buck configuration:
2
? 1 1 ?
?
? I G ON IG OFF ?
I D = IL AVG × ( 1 - D MAX ) × 1 . 5
Dimming MOSFET
Select a dimming MOSFET (Q2) with continuous current
rating at +70°C, higher than the LED current by 30%.
The drain-to-source voltage rating of the dimming
MOSFET must be higher than V LED by 20%.
Feedback Compensation
The LED current control loop comprising of the switch-
ing converter, the LED current amplifier, and the error
amplifier should be compensated for stable control of
the LED current. The switching converter small-signal
transfer function has a right half-plane (RHP) zero for
both boost and boost-buck configurations as the induc-
tor current is in continuous conduction mode. The RHP
zero adds a 20dB/decade gain together with a 90°
phase lag, which is difficult to compensate. The easiest
way to avoid this zero is to roll off the loop gain to 0dB
at a frequency less than one-fifth of the RHP zero fre-
quency with a -20dB/decade slope.
The worst-case RHP zero frequency (f ZRHP ) is calculat-
ed as follows:
Boost configuration:
f ZRHP =
Boost-buck configuration:
where IG ON and IG OFF are the gate currents of the
MOSFET Q1 in amperes when it is turned on and
turned off, respectively, V LED and V INMAX are in volts,
IL AVG is in amperes, f SW is in hertz, and C GD is the
f ZRHP =
V LED × ( 1 - D MAX ) 2
2 π × L × I LED × D MAX
gate-to-drain MOSFET capacitance in farads.
Choose a MOSFET that has a higher power rating than
that calculated by the following equation when the
MOSFET case temperature is at +70°C:
P TOT ( W ) = P COND ( W ) + P SW ( W )
Maxim Integrated
where f ZRHP is in hertz, V LED is in volts, L is the induc-
tance value of L1 in henries (H), and I LED is in amperes.
The switching converter small-signal transfer function
also has an output pole for both boost and boost-buck
configurations. The effective output impedance that
determines the output pole frequency together with the
output filter capacitance is calculated as:
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16834AUP/V+ | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16834AUP/V+T | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16834AUP+ | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16834AUP+T | 功能描述:LED照明驱动器 w/Int Hside Crnt Sns & PWM Dim MOSFET RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX16834EVKIT+ | 功能描述:LED 照明开发工具 MAX16834 Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
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